title: Effect of successful surgical treatment on changes of position during sleep in adults with obstructive sleep apnea syndrome.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the changes of position during sleep as determined by polysomnography before and after upper airway surgery for obstructive sleep apnea syndrome in patients with no response to surgery ("nonresponse group") and in those who did have a response to surgery ("response group").
  
  
  METHODS
  We analyzed a total of 106 polysomnograms from 53 subjects and compared the preoperative-postoperative differences in the frequency of positional changes during sleep and the distribution of sleep positions between the nonresponse group (n = 25) and the response group (n = 28). Surgical response was defined as a greater than 50% decrease in the postoperative apnea-hypopnea index.
  
  
  RESULTS
  The positional change index in the response group was significantly reduced (from 4.2 +/- 3.8 to 2.6 +/- 1.6; p = 0.038), whereas the positional change index in the nonresponse group did not significantly change (from 3.4 +/- 2.0 to 3.4 +/- 2.1; p = 0.861). The proportion of sleep time spent in the supine position did not significantly change in the nonresponse group (from 62.4% +/- 18.1% to 60.5% +/- 21.3%; p = 0.904) or the response group (from 55.5% +/- 23.9% to 60.1% +/- 23.1%; p = 0.412).
  
  
  CONCLUSIONS
  The frequency of positional changes during sleep was significantly decreased with the improvement of respiratory disturbances and arousals in the response group after upper airway surgery.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.
authors.forename: Ji Ho
authors.initials: JH
authors.lastname: Choi
authors.forename: Eun Joong
authors.initials: EJ
authors.lastname: Kim
authors.forename: June
authors.initials: J
authors.lastname: Choi
authors.forename: Soon Young
authors.initials: SY
authors.lastname: Kwon
authors.forename: Heung Man
authors.initials: HM
authors.lastname: Lee
authors.forename: Tae Hoon
authors.initials: TH
authors.lastname: Kim
authors.forename: Sang Hag
authors.initials: SH
authors.lastname: Lee
authors.forename: Chol
authors.initials: C
authors.lastname: Shin
authors.forename: Seung Hoon
authors.initials: SH
authors.lastname: Lee
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D017286:Polysomnography; D011187:Posture / Q000502:physiology*; D012890:Sleep / Q000502:physiology*; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology* / Q000601:surgery*; D016896:Treatment Outcome